摘要:
A compound of formula (I), wherein R1 is hydrogen or a hydroxyl protecting group; and R2 and R3 are same or different and are independently selected from halogen or —O—SO2—X; wherein X is —C1-C4 alkyl; C1-C4 alkyl substituted with one or more halogen; or substituted or unsubstituted phenyl wherein said phenyl substituent is selected from halogen, nitro and C1-C4 alkyl; provided that when R3 is bromine, X is not p-toluoyl; and a process for the preparation thereof.
摘要:
A hydroformylation process comprising reacting a feedstock composition comprising a compound having at least one olefinic carbon-to-carbon bond with hydrogen and carbon monoxide in the presence of an organophosphine modified cobalt hydroformylation catalyst, wherein the hydroformylation process is carried out in at least two reaction zones, wherein the at least two reaction zones comprise an earlier reaction zone and a later reaction zone, wherein the temperature of the later reaction zone is at least about 2° C. greater than the temperature in the earlier reaction zone, and the temperature of the later reaction zone is in the range of from about 140° C. to about 220° C., and the temperature of the earlier reaction zone is at least about 130° C.
摘要:
Disclosed is a process for the preparation of cyclopropylmethanol(hydroxymethylcyclopropane) by the hydrogenation of cyclopropanecarboxaldehyde in the presence of a cobalt or nickel catalyst.
摘要:
An optically active 3-[6(S)-2,2,6-trimethylcyclohexan-1-yl]propanol derivative represented by formula (I): ##STR1## wherein R.sup.1 represents a lower alkyl group, and a perfume containing the same as an active ingredient are disclosed.
摘要:
A method for the preparation of a sex pheromone of Obscure Mealy bug (OMB), (±)(2,3,4,4-tetramethycyclopentyl) methyl acetate includes a step of subjecting alpha-halotetramethylcyclohexanone to a Favorskii rearrangement to obtain a 2,3,4,4-tetramethylcyclopentane compound (2), a step of subjecting the compound (2) to reduction to obtain (2,3,4,4-tetramethylcyclopentyl)methanol compound (3) and a step of subjection the compound (3) to acylation to obtain a (2,3,4,4-tetramethylcyclopentyl)methyl carboxylate compound (4).
摘要:
A novel odorant of formula (I) wherein each of R1, R2, R3, R3, R5, R6, R7, R8, R9 and R10 are independently selected from H, CH3, and C2H5; X is selected from —CH2OH, —CH2OCOCH3 and —CHO, n is selected from 0 and 1. The dotted line represents double bond or single bond.
摘要:
A hydroformylation process for the production of alcohols comprising reacting, in a reactor system comprising one or more feed streams, a reaction environment and an output stream, a feedstock composition comprising a compound having at least one olefinic carbon-to-carbon bond with hydrogen and carbon monoxide in the presence of an organophosphine modified cobalt hydroformylation catalyst, wherein the hydroformylation process is carried out in the reaction environment, which comprises at least two reaction zones, wherein the at least two reaction zones comprise an earlier reaction zone and a later reaction zone, wherein the temperature of the later reaction zone is at a temperature which is at least 2° C. greater than the temperature in the earlier reaction zone, and the temperature of the later reaction zone is in the range of from 140° C. to 220° C., and the temperature of the earlier reaction zone is at least 130° C., wherein the molar ratio of hydrogen to carbon monoxide entering the earlier reaction zone is in the range of from 0.5 to 1.65, and wherein water is added into the reactor system.
摘要:
The present invention relates to the field of catalytic hydrogenation and, more particularly, to the use of Ru complexes with bidentate ligands, having one amino or imino coordinating group and one phosphino coordinating group, in hydrogenation processes for the reduction of esters or lactones into the corresponding alcohol or diol respectively.