Benzylic phosphonium salts undergo the Wittig reaction with aromatic aldehydes using solid KOH in the presence of 18-crown-6 to give (Z)-stilbenes with good stereoselectivity: Tetrahedron Lett., 37, 4225 (1996). See Appendix 1.
安全信息
Safety Statements
S26 In case of contact with eyes, rinse immediately with plenty of water and seek medical advice 眼睛接触后,立即用大量水冲洗并征求医生意见;
S37 Wear suitable gloves 戴适当手套;
S36 Wear suitable protective clothing 穿戴适当的防护服;
Risk Statements
R36/37/38 Irritating to eyes, respiratory system and skin 对眼睛、呼吸系统和皮肤有刺激性