sodium amide), 2-alkenyltris(2-methoxymethoxyphenyl)phosphonium salts carrying an allyl, crotyl, or prenyl (3-methyl-2-butenyl) side chain condense with saturated or unsaturated aldehydes to give conjugated dienes with Z/E ratios ranging from 90:10 to > 99:1 and averaging 96:4. Owing to steric congestion, yields are only moderate (on average 41%; extremes 10-79%). The nonvolatile tris(2-methoxymethoxyphenyl)phosphine
用适当的碱(丁基
锂或
氨基钠)处理后,带有烯丙基,
巴豆基或异
戊烯基(3-甲基-
2-丁烯基)侧链的2-烯基三(2-甲氧基
甲氧基苯基)phosph盐与饱和或不饱和醛缩合,生成Z / E比为90:10至> 99:1,平均为96:4的共轭二烯。由于空间拥堵,单产仅为中等
水平(平均41%;极端
水平为10-79%)。非挥发性三(2-甲氧基
甲氧基苯基)氧化膦副产物可以容易地分离和还原以回收膦原料,或者可以将其
水解为
水溶性三(2-羟苯基)氧化膦。