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preface to fifteenth edition

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7.48 SECTION 7<br />

TABLE 7.21<br />

Absorption Frequencies of Triple Bonds (Continued)<br />

Group Band, cm 1 Remarks<br />

Nitriles 9C#N 2260–2200 (var) Stronger and <strong>to</strong>ward the lower end of the<br />

range when conjugated; occasionally<br />

very weak or absent<br />

Aliphatic<br />

580–555 (m–s)<br />

560–525 (m–s)<br />

390–350 (s)<br />

Aromatic<br />

580–540 (s)<br />

430–380 (m)<br />

Isonitriles R9 N <br />

# C <br />

2175–2150 (s) Very sensitive <strong>to</strong> changes in substituents<br />

or R9N"C:<br />

2150–2115 (s)<br />

1595<br />

Not found for nitriles<br />

Cyanamides<br />

N9C#N L<br />

<br />

<br />

N9C"N<br />

2225–2210 (s)<br />

Thiocyanates<br />

R9S9C#N 2175–2140 (s) Aryl thiocyanates at the upper end of the<br />

range, alkyl at the lower end<br />

404–400 (s) Aliphatic derivatives<br />

ca 600 (m–s)<br />

Nitrile N-oxides<br />

9C#N:O<br />

Diazonium salts<br />

<br />

R9 N#N<br />

Selenocyanates<br />

R9Se9C#N<br />

2305–2285 (s)<br />

1395–1365 (s)<br />

2300–2230 (m–s)<br />

ca 2160 (m–s)<br />

545–520<br />

ca 390<br />

ca 350<br />

Aryl derivatives

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