WebMechanism of the Schlosser Modification. Lithium salts effect, that the intermediate betaines (see Wittig Reaction) do not react further. These lithiobetaines which are quite stable may be deprotonated. Deprotonation is equal to the lost of one stereogenic center. Use of a steric hindered proton donator then leads to the trans lithiobetaine. Web9 dec. 2016 · A AAC 2-mechanism, 247 AAL1-mechanism, 248 Absolute temperature, in Eyring equation, 10 acac, 525 Acetaldehyde, 287 Acetalizations mechanism, 288 …

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WebLithium salts effect, that the intermediate betaines (see Wittig Reaction) do not react further. These lithiobetaines which are quite stable may be deprotonated. Deprotonation is … WebLithiation of both N -phenyl- and O -phenyl-urethanes has been reported. The ortho lithiation of N-t -bu-toxycarbonylaniline and subsequent addition to carbonyls, nitriles and several other electrophiles was first reported by Muchowski in 1980. 57 In some cases the adduct cyclized by attacking the urethane carbonyl. definition of flat affect

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