Harvards advanced organic chemistry

... Springer Verlag Chemistry 206 Box, V G S (1990) “The role of lone pair interactions in the chemistry of the monosaccharides The anomeric effect.” Heterocycles 31: 1157 Advanced Organic Chemistry Box,... 1977 233 Baldwin, J Org Chem 1977, 42, 3846 Baldwin, Tetrahedron 1982, 38, 2939 Chemistry 206 Advanced Organic Chemistry Lecture Number Stereoelectronic Effects-3 "Rules for Ring Closure: Baldwin's... CH2 Allyl carbonium ion: both pi-electrons in bonding state Examples of three-center bonds in organic chemistry A H-bonds: (3–center, 4–electron) O ● H 2C H 2C Allyl Radical: electrons in bonding