A toluene solution of β-chlorocinnamaldehyde and dihydroxy alcohols in the catalytic presence of para-toluenesulphonic acid (PTSA) yield the β-ketoacetal in good to outstanding amount. The catalyst (PTSA), first selectively protect the aldehydic group to form the β-chloroacetal and the subsequent dechlorination by H₂O result the β-ketoacetal. Significant transformation was achieved with electron donating substituent attached at the para-position of cinnamaldehyde. The selective formation of β-keto-1,3-acetal was also obtained with a mixture of 1, 2- and 1, 3- diol. The present reaction consists of a metal-free, economical, robustly feasible, sizeable functional group tolerance and high yield properties. Moreover, the use of different dihydroxy alcohols made this process more benign and valuable towards the metal-free development of ketones. First, of its kind, a rare and unusual multitasking nature of PTSA is observed.

在对甲苯磺酸（PTSA）的催化存在下，β-氯肉桂醛和二羟基醇的甲苯溶液可产生良好至显着量的β-酮缩醛。催化剂（PTSA）首先选择性地保护醛基以形成β-氯缩醛，随后通过H ₂ O脱氯得到β-酮缩醛。通过在对位连接的供电子取代基实现了显着的转化肉桂醛的位置。还用1、2-和1,3-二醇的混合物选择性地形成了β-酮-1,3-缩醛。本反应由无金属的，经济的，鲁棒可行的，可观的官能团耐受性和高产率性质组成。而且，使用不同的二羟基醇使该方法对酮的无金属开发更加有益和有价值。首先，观察到PTSA罕见且不寻常的多任务性质。