申请人:Argus Chemical Corp.
公开号:US04250313A1
公开(公告)日:1981-02-10
2,2,6,6-Tetramethyl-4-piperidone spiroketal carbinol compound of Formula I ##STR1## in which R.sub.1 represents hydrogen, alkyl of one to ten carbon atoms, or aralkyl of seven to ten carbon atoms, and R.sub.2 represents alkyl of one of one to six carbon atoms, is prepared by heating a mixture of a 2,2,6,6-tetramethyl-4-piperidone compound of Formula II ##STR2## or an acid addition salt thereof, and a 1,3 dioxane compound having the formula III ##STR3## in which R.sub.3 and R.sub.4 represent R.sub.1 or aryl of six to ten carbon atoms or taken together represent alkylene of four to eight carbon atoms, removing R.sub.3 R.sub.4 CO compound and recovering 2,2,6,6-tetramethyl-4-piperidonespiroketal compound.
2,2,6,6-四甲基-4-哌啶酮螺环缩酮碳醇化合物I的制备方法,其中R1代表氢、1到10个碳原子的烷基或7到10个碳原子的芳烷基,R2代表1到6个碳原子的烷基,是通过加热II的2,2,6,6-四甲基-4-哌啶酮化合物或其酸加成盐与具有III式的1,3-二氧杂环己烷化合物的混合物来制备的,其中R3和R4代表R1或6到10个碳原子的芳基,或者共同代表4到8个碳原子的亚烷基,去除R3R4CO化合物并回收2,2,6,6-四甲基-4-哌啶酮螺环缩酮化合物。