A process for the resolution of hemiacetal compounds of the formula ##STR1## wherein A is a hydrocarbon chain containing 1 to 16 groups, the said chain optionally containing at least one heteroatom, at least one unsaturation, the assembly of the group constituting the chain may be a mono- or polycyclic system including a spiro or endosystem and the assembly of chain A and the carbon atoms attached thereto can contain at least one chiral atom or the hemiacetal moiety thereto which can present a chirality due to the dissymetric spatial configuration of the molecule and Y is selected from the group consisting of hydrogen, alkyl of 1 to 18 carbon atoms optionally substituted, --CY.sub.3 ' and the .beta.,.gamma.bond together with Y can be part of A and Y' is bromine or chlorine and the resolution of alcohols of the formula R--OH IV wherein R is selected from the group consisting of primary, secondary or tertiary alcohol moiety having at least one asymmetric carbon or the remainder of a substituted alcohol with a chirality due to the dissymetric spatial configuration of the entire molecule comprising reacting in an organic solvent diisobutyl aluminum hydride and a racemate or optical isomer of a compound of the formula ##STR2## wherein A and Y have the above definition to obtain a compound of the formula ##STR3## and reacting the latter with a racemate or optical isomer of a compound of the formula R--OH IV wherein R has the above definition to obtain a compound of the formula ##STR4## wherein Y, A and R have the above definitions, separating the diastereoisomers and cleaving the latter to obtain the enantiomers of the hemiacetal of formula III if the racemate was used above or the alcohol of formula IV if the racemate was used above and novel compounds.
一种用于分离
半缩醛化合物的方法,该
半缩醛化合物的
化学式为##STR1## 其中A是含有1至16个基团的碳氢链,该链可选地含有至少一个杂原子、至少一个不饱和度,构成链的基团集合可以是单环或多环系统,包括螺旋或内部系统,链A和附着在其上的碳原子的集合可以含有至少一个手性原子或
半缩醛基团,该
半缩醛基团由于分子的不对称空间构型而呈现手性,Y选自氢、1至18个碳原子的可选取代烷基、--CY.sub.3'和.beta.、.gamma.键与Y一起可以是A的一部分,Y'是
溴或
氯,分离出具有对映异构体的化合物的方法,包括在有机溶剂中反应
二异丁基铝
氢化物和化合物的外消旋体或光学异构体的混合物,该化合物的
化学式为##STR2## 其中A和Y具有上述定义,以获得化合物的
化学式##STR3## 然后将其与化合物的外消旋体或光学异构体的混合物反应,该化合物的
化学式为R--OH IV,其中R选自具有至少一个不对称碳的主要、次要或
三级醇基,或具有整个分子的不对称空间构型的取代醇的剩余部分,以获得化合物的
化学式##STR4## 其中Y、A和R具有上述定义,分离出对映异构体并断裂后获得化合物的
化学式III的对映体或如果使用了外消旋体,则获得化合物的
化学式IV的醇,并获得新化合物。