2-Substituted-2-cyclopentenones represented by the formula (I): ##STR1## wherein A is a hydroxyl group or ##STR2## and B is a hydrogen atom or A and B are bonded together to form one bonding arm; R.sup.1 represents a substituted or unsubstituted hydrocarbon group having 1 to 10 carbon atoms; R.sup.2 represents a substituted or unsubstituted aliphatic hydrocarbon group having 1 to 10 carbon atoms; R.sup.3 represents a substituted or unsubstituted aliphatic hydrocarbon group having 1 to 10 carbon atoms; wherein, when R.sup.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.sup.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.
公式(I)所表示的2-取代-
2-环戊烯酮,其中A是羟基或 ##STR2##,B是氢原子或A和B结合成一个键合臂;R1代表取代或未取代的碳氢基团,具有1至10个碳原子;R2代表取代或未取代的脂肪烃基团,具有1至10个碳原子;R3代表取代或未取代的脂肪烃基团,具有1至10个碳原子;其中,当R3是与
环戊烯骨架键合的单键时,X代表氢原子、羟基或保护羟基;当R3是与
戊烯骨架键合的双键时,X代表构成所述双键的一部分的键合臂;m和n独立地表示0、1或2。