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Chain Lengthening of Aldoses (Killiani-Fischer synthesis)
The conversion of an aldose to the next higher member includes the subsequent steps :
(a) Creation of a cyanohydrin.
(b) Hydrolysis of - CN to - COOH making aldonic acid.
(c) Conversion of aldonic acid into lactone through heating.
(d) The lactone is lastly reduced along with sodium amalgam or sodium borohydride to provide the higher aldose.
Theory of Meta directing group The substituent, S takes electrons from para and ortho positions. So, m-position becomes a position of comparatively high electron density and fu
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The elements of this group form a number of compounds with halogens. The halogen compounds of S. Se, Te and Po are called as halides. For oxygen, only the fluoro compounds
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