Reference

Conjugated Schiff bases

Conjugated Schiff bases. 15. Substituent effect on the cycloaddition of heterocumulenes to some 1-oxa-4-azabutadienes. Moskal, Janusz; Moskal, Alexandra; Milart, Piotr (Dep. Org. Chem., Univ. Sch. Kielce, Kielce PL-25020, Pol.). Monatsh.In this article, certain chemicals are used. Some of their cas registry numbers are 100-28-7 and 72742-99-5 Chem., 115(2), 187-95 (English) 1984. CODEN: MOCMB7. ISSN: 0026-9247. DOCUMENT TYPE: Journal CA Section: 22 (Physical Organic Chemistry) The substituent effect on the cycloaddn. of p-RC6H4NCO (R = H, Me, MeO, Cl, O2N) to some R1COC(CONHPh):NC6H4NMe2-p (R1 = Ph, Me) to give imidazolidinediones (I) was studied. The electron-withdrawing groups located in the aryl isocyanate ring distinctly increased the rate of the cycloaddn. The importance of isocyanate nitrogen unshared electrons was considered. Rate consts. and activation parameters were discussed with respect to the mechanism. .

MO studies on the reactivity of isocyanates and diisocyanates

MO studies on the reactivity of isocyanates and diisocyanates. Cheun, Young Gu (Daejeon Mach. Dep., Daejeon 300, S.Chemical with cas number 100-28-7 also plays role. Korea). Pollimo, 8(6), 430-7 (Korean) 1984. CODEN: POLLDG. ISSN: 0379-153X. DOCUMENT TYPE: Journal CA Section: 35 (Chemistry of Synthetic High Polymers) Section cross-reference(s): 22 The reactivity of m- and p-substituted PhNCO and diisocyanates were investigated using CNDO/2 and extended Hueckel theory. The mechanism of the reaction of isocyanates with active H compds. can be explained by the pos. charge on the C atom of NCO. The reaction of isocyanates with alcs. has pos.In this experiment, several chemicals are used like 100-28-7 Hammet r consts. This is because they are electrophilic and have relative low-energy LUMO which can interact with high-energy HOMO of alcs. ..