PACLOBUTRAZOL

PRODUCT IDENTIFICATION
CAS NO

76738-62-0

PACLOBUTRAZOL

EINECS NO. 266-325-7
FORMULA C15H20ClN3O
MOL WT. 293.80

H.S. CODE

 2933.99.7900

TOXICITY

  
SYNONYMS Pestanal; Bonsai; Cultar; Paclobutrazol;

[(±)-(R',R')-beta-[(4-Chlorophenyl)methyl]-alpha-(1,1-dimethylethyl)-1H-1,2,4-triazole-1- ethanol; (RS,3RS)-1-(4-Chlorophenyl)-4,4-dimethyl-2-(1H-1,2,4-triazol-1-yl)pentan-3-ol; (2RS,3RS)-1-(4-Chlorophenyl)-4,4-dimethyl-2-(1H-1,2,4-triazol-1-yl)pentan-3-ol; Parlay; Trimmit; beta-((4-Chlorophenyl)methyl)-alpha-(1,1-dimethylethyl)-1H- 1,2,4-triazole-1-ethanol; Other RN: 66346-04-1, 77108-06-6

SMILES

n1c[n@]([C@@H]([C@H](C(C)(C)C)O)Cc2ccc(cc2)Cl)nc1.n1c[n@](nc1) [C@H]([C@@H](C(C)(C)C)O)Cc1ccc(cc1)Cl

CLASSIFICATION

Plant Growth regulator, Herbicide

EXTRA NOTES

 EPA Pesticide Chemical Code 125601

PHYSICAL AND CHEMICAL PROPERTIES

PHYSICAL STATE white crystals
MELTING POINT 164 - 168 C
BOILING POINT

 

SPECIFIC GRAVITY

 

SOLUBILITY IN WATER Soluble

SOLVENT SOLUBILITY

 Soluble in acetone
pH  
VAPOR DENSITY

 

REFRACTIVE INDEX

 

AUTOIGNITION

 

NFPA RATINGS  
FLASH POINT

 

STABILITY

Stable under ordinary conditions.

EXTERNAL LINKS & GENERAL DESCRIPTION

Wikipedia Linking - Paclobutrazol

Google Scholar Search - Paclobutrazol

Drug Information Portal (U.S. National Library of Medicine) - Paclobutrazol

PubChem Compound Summary - Paclobutrazol

http://www.pesticideinfo.org/ -  Paclobutrazol

KEGG (Kyoto Encyclopedia of Genes and Genomes) - Paclobutrazol

http://www.ebi.ac.uk/ - Paclobutrazol

http://www.ncbi.nlm.nih.gov/ - Paclobutrazol

Local:
Paclobutrazol is a triazole type plant growth retardant which blocks gibberellin biosynthesis and are involved in reducing abscisic acid, ethylene and indole-3-acetic acid while increasing cytokinin levels. It promotes fruit set in the states of inhibited development . It is also known that it protect plants against abiotic stresses. Uniconazol is another  triazole type plant growth retardant. Though each plant hormone evokes many different specific biochemical, physiological, or morphological responses, the effects of different hormones overlap and may be stimulatory or inhibitory to regulate plant development and growth. Paclobutrazol  it can be classified as the growth retardants, which can be sub-classified as gibberellin biosynthesis inhibitors or compounds which are not involved in inhibiting gibberellin biosynthesis. [abscisic acid, cimetacarb, daminozide, dikegulac, maleic hydrazide, mefluidide, and morphologically active substances (morphactins: chlorfluren, chlorflurenol, dichlorflurenol, flurenol)].

Some commercial growth retardants are;

  • Abscisic acid [(2Z,4E)-5-[(1S)-1-hydroxy-2,6,6-trimethyl-4-oxo-2-cyclohexen-1-yl]-3-methyl-2,4- pentadienoic acid, CAS RN: 21293-29-8]
  • Ancymidol [alpha-cyclopropyl-α-(4-methoxyphenyl)-5-pyrimidinemethanol, CAS RN: 12771-68-5]
  • Butralin [4-(1,1-dimethylethyl)-N-(1-methylpropyl)-2,6-dinitrobenzenamine, CAS RN: 33629-47-9]
  • Carbaryl [1-naphthalenyl methylcarbamate, CAS RN: 63-25-2]
  • Chlorfluren [2-chloro-9H-fluorene-9-carboxylic acid, CAS RN: 24539-66-0]
  • Chlorflurenol 2-chloro-9-hydroxy-9H-fluorene-9-carboxylic acid, CAS RN: 2464-37-1]
  • Chlormequat 2-chloro-N,N,N-trimethylethanaminium CAS RN.:7003-89-6
  • Chlorpropham [1-methylethyl (3-chlorophenyl)carbamate, CAS RN: 101-21-3]
  • Daminozide butanedioic acid mono(2,2-dimethylhydrazide) CAS RN.:1596-84-5
  • Dichlorflurenol [2,7-dichloro-9-hydroxy-9H-fluorene-9-carboxylic acid, CAS RN: 69622-79-3]
  • Dikegulac [2,3:4,6-bis-O-(1-methylethylidene)-α-L-xylo-2-hexulofuranosonic acid, CAS RN: 18467-77-1]
  • Flumetralin [2-chloro-N-[2,6-dinitro-4-(trifluoromethyl)phenyl]-N-ethyl-6- fluorobenzenemethanamine, CAS RN: 62924-70-3]
  • Fluoridamid [N-[4-methyl-3-[[(trifluoromethyl)sulfonyl]amino]phenyl]acetamide, CAS RN: 47000-92-0]
  • Flurenol [9-hydroxy-9H-fluorene-9-carboxylic acid, CAS RN: 467-69-6]
  • Flurprimidol [alpha-(1-methylethyl)-α-[4-(trifluoromethoxy)phenyl]-5-pyrimidinemethanol, CAS RN: 56425-91-3]
  • Fosamine [ethyl hydrogen (aminocarbonyl)phosphonate, CAS RN: 59682-52-9]
  • Glyphosine [N,N-bis(phosphonomethyl)glycine, CAS RN: 2439-99-8]
  • Isopyrimol [alpha-(4-chlorophenyl)-α-(1-methylethyl)-5-pyrimidinemethanol, CAS RN: 55283-69-7]
  • Jasmonic acid [(1R,2R)-3-oxo-2-(2Z)-2-pentenylcyclopentaneacetic acid, CAS RN: 6894-38-8]
  • Maleic hydrazide [1,2-dihydro-3,6-pyridazinedione, CAS RN: 123-33-1]
  • Mefluidide [N-[2,4-dimethyl-5-[[(trifluoromethyl)sulfonyl]amino]phenyl]acetamide, CAS RN: 53780-34-0]
  • Mepiquat [1,1-dimethylpiperidinium, CAS RN: 15302-91-7]
  • Paclobutrazol [(±)-(R',R')-beta-[(4-chlorophenyl)methyl]-alpha-(1,1-dimethylethyl)-1H-1,2,4-triazole-1- ethanol, CAS RN: 76738-62-0]
  • Piproctanyl [1-(3,7-dimethyloctyl)-1-(2-propenyl)piperidinium, CAS RN: 69309-47-3]
  • Prohydrojasmon [ (±)-Propyl (1R,2R)-3-oxo-2-pentylcyclopentaneacetate, CAS RN: 158474-72-7]
  • Propham [1-methylethyl phenylcarbamate, CAS RN: 122-42-9]
  • Tetcyclacis [ (±)-(3aR,4R,4aS,6aR,7R,7aS)-1-(4-chlorophenyl)-3a,4,4a,6a,7,7a- hexahydro-4,7-methano-1H-[1,2]diazeto[3,4-f] benzotriazole, CAS RN: 77788-21-7]
  • 2,3,5-Triiodobenzoic acid [CAS RN: 88-82-4]
  • Uniconazole [ (betaE)-beta-[(4-chlorophenyl)methylene]-alpha-(1,1-dimethylethyl)-1H-1,2,4- triazole-1-ethanol, CAS RN: 83657-22-1]
SALES SPECIFICATION

APPEARANCE

 white to light grey crystalline powder

ASSAY

95.0% min

ACIDITY

0.5% max

Loss on drying

1.0% max

INSOLUBLES

0.5% max (in acetone)
TRANSPORTATION
PACKING

 

HAZARD CLASS 4.1 (Packing Group: II)
UN NO. 1325
OTHER INFORMATION

Hazard Symbols: XN, Risk Phrases: 22, Safety Phrase: 36

GENERAL DESCRIPTION OF PLANT HORMONE
Auxin is one of five (or more) major plant hormones (Auxin, Cytokinins, Gibberellins, Ethylene and Abscisic acid) which affect numerous plant growth processes functions including cell division and elongation, autumnal loss of leaves, and the formation of buds, roots, flowers, and fruit. Auxin action is inhibited by light which is an important role of the growth of stems toward light (phototropism), against the force of gravity (geotropism) and positively hydrotropic (moisture-seeking). The cells exposed to light don't grow as quickly as those on the shaded side, and thus the plant grows toward the light source. Auxins usually have a ring system with at least one double bond and attached by a side-chain that terminates in a carboxyl group. Indole acetic acid is the exact structure of Auxin activity. Parent compounds of auxin action are;
  • Auxins
    • 4-Chlorophenoxyacetic acid (CAS RN: 122-88-3)
    • (2,4-Dichlorophenoxy)acetic acid (CAS RN: 94-75-7)
    • 4-(2,4-Dichlorophenoxy)butyric acid (CAS RN: 94-82-6)
    • Tris[2-(2,4-Dichlorophenoxy)ethyl] phosphite (CAS RN: 94-84-8)
    • 2-(2,4-Dichlorophenoxy)propanoic acid (CAS RN: 120-36-5)
    • 2-(2,4,5-trichlorophenoxy)propanoic acid (CAS RN: 93-72-1)
    • Indole-3-acetic acid (CAS RN: 87-51-4)
    • Indole-3-butyric acid (CAS RN: 133-32-4)
    • 1-Naphthaleneacetamide (CAS RN: 86-86-2)
    • 1-Naphthaleneacetic acid (CAS RN: 86-87-3)
    • 1-Naphthol (CAS RN: 90-15-3)
    • Naphthoxy acetic acid (CAS RN: 120-23-0)
    • Naphthenic acid, inorganic salts (potassium, sodium)
    • (2,4,5-Trichlorophenoxy) Acetic acid (CAS RN: 93-76-5)
  • Antiauxins
    • Clofibric acid (CAS RN: 882-09-7)
    • 2,3,5-Triiodobenzoic acid (CAS RN: 88-82-4)

Cytokinin is a N6-substituted adenines acting as phytohormones  such as kinetin, zeatin, 6-isopentenyladenine, benzyl adenine. The principal functions are stimulate cell division in concert with auxin (cytokinesis) and influence the pathway of tissue differentiation (organogenesis). 6-Benzylaminopurine is the first generation synthetic cytokinin which elicits plant growth and development responses setting blossoms and stimulating fruit richness by stimulating cell division. Active cytokinin ingredients include:

  • Adenine (CAS RN: 73-24-5)
  • Adenine Hemisulfate salt (CAS RN: 321-30-2)
  • 6-Benzylaminopurine (CAS RN: 1214-39-7(base), 162714-86-5(HCl)
  • N-Benzyl-9-(2-tetrahydropyranyl)adenine (CAS RN: 2312-73-4)
  • N-(2-Chloro-4-pyridyl)-N'-phenylurea (CAS RN: 68157-60-8)
  • 6-(gamma,gamma-Dimethylallylamino)purine (CAS RN: 2365-40-4)
  • 1,3-Diphenylurea (CAS RN: 102-07-8)
  • Kinetin (CAS RN: 525-79-1 (base), 177966-68-6 (HCl)
  • 1-Phenyl-3-(1,2,3-thiadiazol-5-yl) Urea (CAS RN: 51707-55-2)
  • Zeatin (CAS RN: 13114-27-7)
  • trans-Zeatin (CAS RN: 1637-39-4 (base), 6025-81-6 (HCl))
  • trans-Zeatin riboside (CAS RN: 6025-53-2)

Other Plant Growth Regulators include:

  • Abscisic acid (CAS RN: 21293-29-8)
  • Ancymidol (CAS RN: 12771-68-5)
  • Chlorocholine chloride (CAS RN: 999-81-5)
  • Daminozide (CAS RN: 1596-84-5)
  • 3,6-Dichloro-o-anisic acid (CAS RN: 1918-00-9)
  • Gibberellic acid (CAS RN: 77-06-5)
  • Gibberellic acid Potassium salt (CAS RN: 125-67-7)
  • Gibberellin A4 (CAS RN: 468-44-0  ) and other gibberellins (more than 110 gibberellins are known)
  • Glyphosate (CAS RN: 1071-83-6)
  • Jasmonic acid (CAS RN: 3572-66-5)
  • 1,3,5-Trihydroxybenzene (CAS RN: 108-73-6)