| abstract |
NEW MATERIAL:A compound expressed by formula I [R 3 is 1W2C alkyl; R 1 and R 2 are H, acyl or together form a group expressed by formula II (R 4 and R 5 are 1W2C alkyl, provided that R 3 is methyl)]. n EXAMPLE: (22R,23R,24R)-2α,3α-Diacetoxy-22,23-epoxy-B-homo-7-oxa-5α-ergostan-6- one. n USE: A plant growth regulator. n PREPARATION: A compound expressed by formula III is oxidized to provide a compound shown by formula IV. The resultant derivative is subsequently oxidized or hydroxyl group thereof is acylated or acetalized to produce a derivative expressed by formula V, which is then subsequently oxidized. n COPYRIGHT: (C)1989,JPO&Japio |