2-Substituted-2-cyclopentenones.

摘要

2-Substituted-2-cyclopentenones represented by the formula (I): <CHEM> wherein A is a hydroxyl group or <CHEM> and B is a hydrogen atom or A and B are bonded together to form one bonding arm; R<1> represents a substituted or unsubstituted hydrocarbon group having 1 to 10 carbon atoms; R<2> represents a substituted or unsubstituted aliphatic hydrocarbon group having 1 to 10 carbon atoms; R<3> represents a substituted or unsubstituted aliphatic hydrocarbon group having 1 to 10 carbon atoms; wherein, when R<3> is a single bond bonded to the cyclopentene skeleton, X represents a hydrogen atom, a hydroxyl group or a protected hydroxyl group; and when R<3> is a double bond bonded to the pentene skeleton, X represents a bonding arm constituting a part of said double bond; and m and n independently represent 0, 1 or 2.