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preface to fifteenth edition

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8.38 SECTION 8<br />

TABLE 8.8<br />

pK a Values of Organic Materials in Water at 25C (Continued)<br />

Substance pK 1 pK 2 pK 3 pK 4<br />

Cyclohexylcyanoacetic acid 2.367<br />

1,2-Cyclohexylenedinitriloacetic 2.4 3.5 6.16 12.35<br />

acid ( 0.1)<br />

3-Cyclohexylpropanoic acid 4.91<br />

2-Cyclohexylpyrrolidine<br />

10.76(1)<br />

2-Cyclohexyl-2-pyrroline<br />

7.91(1)<br />

Cyclohexylthioacetic acid 3.488<br />

Cyclopentanecarboxylic acid 4.905<br />

cis-Cyclopentane-1-carboxylic 4.40 5.79<br />

acid-2-acetic acid<br />

trans-Cyclopentane-1-carboxylic 4.39 5.67<br />

acid-2-acetic acid<br />

Cyclopentane-1,2-diamine-N,N,Ntetraacetic<br />

— — — 10.20<br />

acid ( 0.1)<br />

Cyclopentane-1,1-dicarboxylic acid 3.23 4.08<br />

cis-Cyclopentane-1,2-dicarboxylic 4.43 6.67<br />

acid<br />

trans-Cyclopentane-1,2-dicarboxylic<br />

3.96 5.85<br />

acid<br />

cis-Cyclopentane-1,3-dicarboxylic 4.26 5.51<br />

acid<br />

trans-Cyclopentane-1,3-dicarboxylic<br />

4.32 5.42<br />

acid<br />

Cyclopentylamine<br />

10.65(1)<br />

1,1-Cyclopentyldiacetic acid 3.80 6.77<br />

cis-Cyclopentyl-1,2-diacetic acid 4.42 5.42<br />

trans-Cyclopentyl-1,2-diacetic acid 4.43 5.43<br />

Cyclopropanecarboxylic acid 4.827<br />

Cyclopropane-1,1-dicarboxylic acid 1.82 5.43<br />

cis-Cyclopropane-1,2-dicarboxylic 3.33 6.47<br />

acid<br />

trans-Cyclopropane-1,2-dicarboxylic<br />

3.65 5.13<br />

acid<br />

Cyclopropylamine<br />

9.10(1)<br />

5-Cyclopropyl-1,2,3,4-tetrazole 4.90(1)<br />

L-Cysteic acid (3-sulfo-L-alanine) 1.89(1) 8.7(0)<br />

L-()-Cysteine 1.96 8.18 10.29(SH)<br />

L-()-Cysteine, ethylester 6.69<br />

9.17(SH)<br />

(NH 3 )<br />

L-()-Cysteine, methylester 6.56<br />

8.99(SH)<br />

(NH 3 )<br />

L-Cysteinyl-L-asparagine 2.97 7.09 8.47<br />

L-Cystine (35C) 1.6(2) 2.1(1) 8.02(0) 8.71(1)<br />

Cystinylglycylglycine (35C) 3.12 3.21 6.01 6.87<br />

Cytidine 4.08(1) 12.24(0)<br />

Cytidine-2-phosphoric acid 0.8(1) 4.36(0) 6.17(1)<br />

Cytidine-3-phosphoric acid 0.80(1) 4.31(0) 6.04(1) 13.2(sugar)<br />

Cytidine-5-phosphoric acid — 4.39(0) 6.62(1)<br />

Cy<strong>to</strong>sine 4.58(1) 12.15(0)<br />

Decanedioic acid (sebacic acid) 4.59 5.59<br />

Dehydroascorbic acid (20C) 3.21 7.92 10.3<br />

2-Deoxyadenosine ( 0.1) 3.8(1)

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