申请人:BASF Aktiengesellschaft
公开号:US05196609A1
公开(公告)日:1993-03-23
The preparation of 3-alkoxycarbonyl propenals and 3-dialkoxymethyl propenals of the general formulae Ia and Ib respectively: ##STR1## (R.sup.1 =C.sub.1 -C.sub.3 -alkyl group; R.sup.2 and R.sup.3 =hydrogen, methyl, or ethyl; and R.sup.4 and R.sup.5 =C.sub.1 -C.sub.4 -alkyl groups, which may be joined to form a 5-membered or 6-membered ring), is effected by reacting a corresponding alcohol of the general formula IIa or IIb ##STR2## with oxygen or an oxygen-containing gas in the gas phase in the presence of a metal from Group IB of the Periodic Table or a compound of one such metal acting as catalyst. The target products serve as intermediates for the synthesis of carotenoids.
通式Ia和Ib的3-烷氧羰基丙烯醛和3-双烷氧甲基丙烯醛的制备方法如下:(其中R1=C1-C3烷基;R2和R3=氢、甲基或乙基;R4和R5=C1-C4烷基,可以连接成5-或6-元环)。将通式IIa或IIb的相应醇与氧气或含氧气体在气相中在IB族元素或其化合物作为催化剂的存在下反应。目标产物可用作类胡萝卜素的合成中间体。