Described are intermediates, acetals formed in processes for producing novel 2-alkylidene-3-alkynals and 2-alkylidene-3-alkenals which processes comprise reacting an alkyl metallo acetylide with a dialkoxy acetonitrile or a dialkoxy dialkyl acetamide to form an imine salt, hydrolyzing the imine salt to form a 1,1-dialkoxy-3-alkyn-2-one, alternatively (a) first treating the alkynone with an alkylidene tri-substituted phosphorane or an alkylidene phosphorous triamide or an alkyl phosphoramide anionic compound to provide a dialkoxy alkylidene alkyne, and then either (1) hydrolyzing the dialkoxy alkylidene alkyne to form a novel aldehyde, an alkylidene alkynal, and if desired, reducing the triple bond of the alkylidene alkynal to a double bond to obtain the corresponding alkylidene alkenal or (2) first reducing the dialkoxy alkylidene alkyne to form a 1,1-dialkoxy-2-alkylidene-3-alkene and if desired then hydrolyzing said 1,1-dialkoxy-2-alkylidene-3-alkene to form the desired 2-alkylidene-3-alkenal; or (b) first reducing the alkynone to form a 1,1-dialkoxy-3-alken-2-one and then treating the 1,1-dialkoxy-3-alken-2-one with an alkylidene tri-substituted phosphorane or an alkylidene phosphorous triamide or an alkyl phosphoramide anionic compound to provide a dialkoxy alkylidene alkene and, if desired, then hydrolyzing said dialkoxy alkylidene alkene to form the desired 2-alkylidene-3-alkenal.
描述了在生产新型2-烷基亚炔醛和2-烷基亚烯醛的过程中形成的中间体,这些过程包括将烷基
金属炔基与二烷氧基
乙腈或二烷氧基二烷基乙酰胺反应以形成
亚胺盐,
水解
亚胺盐以形成1,1-二烷氧基-3-炔基-2-酮,或者(a)首先用烷基亚
磷酰基三取代
磷烷或烷基亚
磷酰基三胺或烷基
磷酰胺阴离子化合物处理炔酮以提供二烷氧基烷基亚炔,然后(1)
水解二烷氧基烷基亚炔以形成新型醛,烷基亚炔醛,如果需要,将烷基亚炔醛的三键还原为双键以获得相应的烷基亚烯醛,或者(2)首先将二烷氧基烷基亚炔还原为1,1-二烷氧基-2-烷基亚烯,并在需要时
水解所述的1,1-二烷氧基-2-烷基亚烯以形成所需的2-烷基亚烯醛;或者(b)首先将炔酮还原为1,1-二烷氧基-3-烯-2-酮,然后用烷基亚
磷酰基三取代
磷烷或烷基亚
磷酰基三胺或烷基
磷酰胺阴离子化合物处理1,1-二烷氧基-3-烯-2-酮以提供二烷氧基烷基亚烯,并在需要时
水解所述的二烷氧基烷基亚烯以形成所需的2-烷基亚烯醛。