388075-83-0

Basic information

• Product Name: (2E,6E,8E)-4-bromo-3,7-dimethyl-9-(2,6,6-trimethyl-1-cyclohexenyl)-2,6,8-nonatrienyl acetate
• Synonyms: (2E,6E,8E)-4-bromo-3,7-dimethyl-9-(2,6,6-trimethyl-1-cyclohexenyl)-2,6,8-nonatrienyl acetate
• CAS NO: 388075-83-0
• Molecular Weight: 409.407
• Mol File: 388075-83-0.mol
• Article Data: 1

Chemical Properties

• CAS DataBase Reference: (2E,6E,8E)-4-bromo-3,7-dimethyl-9-(2,6,6-trimethyl-1-cyclohexenyl)-2,6,8-nonatrienyl acetate(CAS DataBase Reference)
• NIST Chemistry Reference: (2E,6E,8E)-4-bromo-3,7-dimethyl-9-(2,6,6-trimethyl-1-cyclohexenyl)-2,6,8-nonatrienyl acetate(388075-83-0)
• EPA Substance Registry System: (2E,6E,8E)-4-bromo-3,7-dimethyl-9-(2,6,6-trimethyl-1-cyclohexenyl)-2,6,8-nonatrienyl acetate(388075-83-0)

Safety Data

• Hazardous Substances Data: 388075-83-0(Hazardous Substances Data)

Upstream product

• 388075-80-7 2-[(E)-3-methoxy-3-methyl-1,4-pentadienyl]-1,3,3-trimethylcyclohexene 
• 26586-02-7 (E)-4-acetoxy-2-methylcrotonaldehyde 
• 388075-82-9 (2E,6E,8E)-4-hydroxy-3,7-dimethyl-9-(2,6,6-trimethyl-1-cyclohexenyl)-2,6,8-nonatriene acetate 
• 59057-30-6 (1E)-1-(2,6,6-trimethylcyclohex-1-enyl)-3-methyl-1,4-pentadien-3-ol 

Downstream Products

• 127-47-9 Retinol acetate 

Relevant articles and documents

The organoalkali route to vitamin A and β-carotene

The reductive cleavage of methyl vinyl-β-ionyl ether (1) or the deprotonation of 3,2′,6′,6′-tetramethyl-5-(1-cyclohexenyl)-1, 3-pentadiene (2) gives rise to an organometallic C15 species that combines selectively with a variety of electrophiles at the terminal chain position. Its reaction with aldehydes, however, is less clean. In particular, (E)-β-formyl-2-butenyl acetate gives the expected adduct 7a and, after dehydration, vitamin A acetate only in poor yield. The same is true for the analogous reaction with 2,7-dimethyl-2,4,6-octatriendial, which ultimately affords βcarotene. Vitamin A acetate can also be prepared, this time in moderate yield, by functionalization through consecutive deprotonation, borylation, oxidation and acetylation of a C20 pentaene hydrocarbon having the required skeleton. Both the C15 and the C20 organometallic key intermediates adopt spontaneously a zigzag-like outstretched conformation which, upon electrophilic trapping, directly and exclusively leads to the all-(E) configuration.