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Unformatted text preview: bination erythrose and threose are aldotetroses. 2                                                          Aldohexoses have 4 chiral centers. Meso forms are impossible, so there are 24 = 16 steroisomeric aldohexoses: 8 D,L-pairs, of which the glucoses are one. 3 Aldehydes and some ketones react with alcohols to form hemiacetals – O H R1 C H(R2) + H aldehyde or ketone OR3 OH + R1 C H(R2) OR3 hemiacetal alcohol R1, R2, and R3 are different R groups; the subscripts do not indicate how many groups. Aldoses and ketoses may form inte...
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