29Si chemical shifts and additivity in pertrimethylsilylated O‐methyl, O‐benzyl, O‐benzoyl and O‐acetyl methyl β‐ D ‐xylopyranosides

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Abstract 29Si chemical shifts in pertrimethylsilylated O‐methyl, O‐benzoyl, O‐benzoyl and O‐acetyl methyl β‐D‐xylopyranoside derivatives are reported. The chemical shifts in monotrimethylsilyl derivatives with the same O‐substituents are in the order: δ(Si‐2) > δ(Si‐4) > δ(Si‐3). When the chemical shifts in bis (trimethylsilyl) and tris(trimethylsilyl) derivatives are assigned according to this rule, all the chemical shifts agree well with a direct additivity rule. The only significant deviation from additivity occurs for methyl 2,4‐di‐O‐benzoyl‐3‐O‐trimethylsilyl‐β‐D‐xylopyranoside, which has a different average conformation from the other compounds studied.