Detail of "5345-89-1"

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Water participation in the crystalline-state photodimerization of cinnamic acid derivatives

Water participation in the crystalline-state photodimerization of cinnamic acid derivatives. A new type of organic photoreaction. Nakanishi, Fusae; Nakanishi, Hachiro; Tsuchiya, Michio; Hasegawa, Masaki (Res. Inst. Polym. Text., Yokohama, Japan). Bull. Chem. Soc. Jpn., 49(11), 3096-9 (English) 1976.Some commonly used reagents like 62474-94-6 and 5345-89-1 are used in this experiment. CODEN: BCSJA8. DOCUMENT TYPE: Journal CA Section: 22 (Physical Organic Chemistry) A new type of org. photoreaction, a water-participation reaction in the cryst. state, was investigated. The photoirradn. of p-formylcinnamic acid (p-FCA) crystals in the presence of water led to 4,4'-diformyl-.beta.-truxinic acid (p-FCA dimer), which has one mol. of crystal water. A comparison of the photodimerization carried out in the presence/absence of water revealed the effects of the water mol. on the reaction. The water mol. is incorporated into the p-FCA dimer during the photodimerization process, and water accelerates the reaction rate of photodimerization, leading to the formation of the cryst. dimer, whereas only the water-free amorphous dimer results in the absence of water. In addn., by heating at 100-110.degree., the p-FCA dimer with a water mol. is converted into a water-free cryst. dimer, which is not attainable from a water-free amorphous dimer. The photodimerization of several .beta.-form crystals of cinnamic acid derivs. was examd. from the viewpoint of water-participation: p-nitro-, p-chloro-, and 3,4-dichlorocinnamic acid photodimerized in the same manner as p-FCA. .