Preparation of a new type of electron-deficient olefins: .beta.-phenylthio nitro olefins, .beta.-sulfinyl nitro olefins, and .beta.-sulfonyl nitro olefins
Preparation of a new type of electron-deficient olefins: .beta.-phenylthio nitro olefins, .beta.-sulfinyl nitro olefins, and .beta.-sulfonyl nitro olefins