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preface to fifteenth edition

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7.58 SECTION 7<br />

TABLE 7.26<br />

Absorption Frequencies of Miscellaneous Bands<br />

Abbreviations Used in the Table<br />

m,moderately strong<br />

m–s,moderate <strong>to</strong> strong<br />

s,strong<br />

var,of variable strength<br />

vs,very strong<br />

w,weak<br />

w–m,weak <strong>to</strong> moderately strong<br />

Group Band,cm 1 Remarks<br />

Ethers<br />

Saturated aliphatic<br />

C9O9C 1150–1060 (vs) Two peaks may be observed for<br />

branched chain,usually 1140–1110<br />

cm 1 .<br />

1140–900 (s) Usually 930–900 cm 1 ; may be absent<br />

for symmetric ethers<br />

Alkyl–aryl<br />

"C9O9C<br />

1270–1230 (vs)<br />

1120–1020 (s)<br />

"CO stretching<br />

CO stretching<br />

Vinyl 1225–1200 (s) Usually about 1205 cm 1<br />

Diaryl<br />

"C9O9C"<br />

Cyclic<br />

1200–1120 (s)<br />

1100–1050 (s)<br />

1270–1030 (s)<br />

Epoxides<br />

C<br />

O<br />

C<br />

1260–1240 (m–s)<br />

880–805 (m)<br />

950–860 (var)<br />

865–785 (m)<br />

770–750 (m)<br />

Monosubstituted<br />

Trans form<br />

Cis form<br />

Trisubstituted<br />

Ketals and acetals<br />

Phthalanes<br />

Aromatic methylenedioxy<br />

1190–1140 (s)<br />

1195–1125 (s)<br />

1100–1000 (s)<br />

1060–1035 (s)<br />

915–895 (s)<br />

1265–1235 (s)<br />

Strongest band<br />

Sometimes obscured<br />

9O9O9<br />

Peroxides<br />

900–830 (w)<br />

1150–1030 (m–s)<br />

ca 1000 (m)<br />

Alkyl<br />

Aryl

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