Alkenes synthesis from

COREY - WINTER Alkene synthesis Alkene synthesis from glycols via cyclic t, 2-lhionocartx)nates... 

The Zweifel trans-alkene synthesis from dialkyl-1-alkenylboranes involves the hy-droboration of 1-halo-l-alkynes with dialkylborane (Eq. 69) 126). It is of interest that the base produces a transfer with inversion 126 127). 

Even the ease of retrieval or possible photocatalytic uses or such in alkene synthesis from the carbonyl compounds principal in biochemistry (McMurry reaction) apparently cannot compensate for this as Ti is unable to bind the primary substrate. Eor Al, Zr or Ti abundance cannot replace catalytic versatility with respect to various functions, that is... 

Alkene synthesis from glycols via cyclic 1,2-thionocarbonates (Corey-Winter) or 1,3-dioxolanes (Eastwood) (see 1st edition). 

Hofmann elimination Alkene synthesis from quaternary ammonium salts, used to determine the structure of amines. 

Alkene synthesis from lc-dinitro compounds. In the original synthesis (4, 460-461), sodium sulfide (or sodium thiophenoxide) was used as the reducing agent. This method, however, does not tolerate various functional groups ester, keto, cyano, or ether. This defect can be remedied by use of calcium amalgam, which reduces nitro groups more readily than other common functional groups. Examples ... 

Alkene Synthesis from a Primary Alcohol and Strong Acid at Elevated Temperature E2... 

Compare the following methods of alkene synthesis from a general primary alcohol. State the advantages and disadvantages of each one. 

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