Isolation of 3,4,5,6-Tetramethyl-1,2-dip
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Dr. Henner Straub
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Article
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1974
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John Wiley and Sons
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English
โ 248 KB
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study ( < -30"C)1111. This is best evidenced by the upfield shift of protons H' (by 23Hz) and H5 (by 32Hz) on going from ( 3 ) to ( 5 ) , which simply reflects the increased availability of the lone pair for limited delocalization but is clearly inconsistent with the development of the diamagnetic r