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594306435銀蟲(chóng) (小有名氣)
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| 用亞磷酸三乙酯代替三苯基膦所制得的磷Ylide與醛酮反應(yīng)稱(chēng)為Wittig-Horner反應(yīng)。該反應(yīng)有兩個(gè)優(yōu)點(diǎn):一是它容易和醛酮反應(yīng),有些有三苯基膦制備的磷葉立德,特別是當(dāng)α碳上帶有羰基時(shí),比較穩(wěn)定,不容易和酮帶有,有時(shí)需加入苯甲酸作為催化劑。二是反應(yīng)中的另一產(chǎn)物,O,O-二乙基磷酸鈉溶于水,無(wú)需像三苯基膦的葉立德時(shí),還需要分離三苯氧膦。三是磷酸酯的反應(yīng),立體選擇性很強(qiáng),產(chǎn)物主要是反式。 |
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| Triethyl phosphate which was instead of Triphenylphosphine was prepared for P-ylide . Wittig-Horner reaction was Defined as the reaction of Keto-Aldehyde and above P-ylide . This reaction had two advantages: The first was that it could react with Keto-Aldehyde easily , some P-ylide which was prepared by Triphenylphosphine , especially as there was carbonyl on α-Cedrene , it was Relatively stable and it could not be with ketone easily , sometimes it might be needed benzoic acid as catalyst . The second was that Another product of the reaction: O, O - diethyl sodium was soluble in water , Triphenylphosphine oxide did not need to be separated when P-ylide was prepared by Triphenylphosphine . The third was that the reaction of phosphoric ester had very strong stereoselectivity , and the product of the reaction was mainly antiform . |
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