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preface to fifteenth edition

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SPECTROSCOPY 7.131<br />

TABLE 7.76<br />

Condensed Table of Mass Spectra (Continued)<br />

Mass numbers (and intensities) of:<br />

Molecular<br />

formula<br />

Name<br />

Parent<br />

peak<br />

Base<br />

peak<br />

Three next most intense peaks<br />

C 4 H 8 Cyclobutane 56(41) 28(65) 41(58) 27(27) 26(15)<br />

C 4 H 8 2-Methylpropene 56(36) 41(85) 39(37) 28(18) 27(17)<br />

C 4 H 8 1-Butene 56(32) 41(87) 39(30) 27(26) 28(26)<br />

C 4 H 8 cis-2-Butene 56(36) 41(76) 39(27) 27(25) 28(24)<br />

C 4 H 8 trans-2-Butene 56(37) 41(80) 27(27) 39(26) 28(26)<br />

C 4 H 8 Cl 2 1,2-Dichlorobutane 126(0.30) 41(39) 77(35) 27(20) 76(16)<br />

C 4 H 8 Cl 2 1,4-Dichlorobutane 126(0.03) 55(87) 41(29) 27(24) 90(23)<br />

C 4 H 8 Cl 2 dl-2,3-Dichlorobutane 126(0.95) 63(63) 62(58) 27(57) 55(29)<br />

C 4 H 8 Cl 2 meso-2,3-Dichlorobutane 126(0.95) 63(64) 27(57) 62(54) 55(31)<br />

C 4 H 8 N 2 Acetaldazine 84(23) 42(92) 15(47) 28(46) 69(38)<br />

C 4 H 8 O Butanal 72(19) 27(41) 29(38) 44(34) 43(32)<br />

C 4 H 8 O 2-Butanone 72(17) 43(97) 29(24) 27(15) 57(6.0)<br />

C 4 H 8 O Ethyl ethenyl ether 72(27) 44(64) 43(56) 29(49) 27(43)<br />

C 4 H 8 O cis-2,3-Epoxybutane 72(3.6) 43(67) 44(39) 27(35) 29(33)<br />

C 4 H 8 O trans-2,3-Epoxybutane 72(3.5) 43(69) 44(35) 29(32) 27(31)<br />

C 4 H 8 O Tetrahydrofuran 72(22) 42(76) 41(39) 27(25) 71(20)<br />

C 4 H 8 O 2 2-Methyl-1,3-dioxacyclopentane 88(0.33) 73(67) 43(48) 45(44) 29(34)<br />

C 4 H 8 O 2 1,4-Dioxane 88(42) 28(138) 29(51) 58(33) 31(24)<br />

C 4 H 8 O 2 2-Methylpropanoic acid 88(8.1) 43(77) 41(33) 27(26) 73(19)<br />

C 4 H 8 O 2 n-Butanoic acid 88(1.0) 60(40) 73(12) 27(9.6) 41(9.1)<br />

C 4 H 8 O 2 n-Propyl formate 88(0.41) 31(123) 42(89) 29(38) 27(36)<br />

C 4 H 8 O 2 Ethyl acetate 88(7.1) 43(181) 29(46) 45(24) 27(24)<br />

C 4 H 8 O 2 Methyl propanoate 88(23) 29(110) 57(83) 27(40) 59(27)<br />

C 4 H 8 S 3-Methylthiacyclobutane 88(42) 46(101) 45(31) 39(24) 47(21)<br />

C 4 H 8 S Thiacyclopentane 88(44) 60(82) 45(29) 46(29) 47(22)<br />

C 4 H 9 Br 1-Bromobutane 136(7.0) 57(86) 41(63) 29(50) 27(46)<br />

C 4 H 9 Br 2-Bromobutane 136(0.72) 57(108) 41(65) 29(61) 27(36)<br />

C 4 H 9 N Pyrrolidine 71(24) 43(102) 28(38) 70(33) 42(20)<br />

C 4 H 9 NO 2 n-Butyl nitrite 103(0.0) 27(55) 43(54) 41(50) 30(47)<br />

C 4 H 10 2-Methylpropane 58(3.2) 43(117) 41(45) 42(39) 27(33)<br />

C 4 H 10 n-Butane 58(12) 43(100) 29(44) 27(37) 28(33)<br />

C 4 H 10 Hg Diethylmercury 260(12) 29(188) 27(54) 28(21) 231(15)<br />

C 4 H 10 O 2-Methyl-1-propanol 74(7.5) 43(84) 31(56) 42(48) 41(47)<br />

C 4 H 10 O 2-Methyl-2-propanol 74(0.0) 59(92) 31(31) 41(19) 43(14)<br />

C 4 H 10 O 1-Butanol 74(0.37) 31(52) 56(44) 41(31) 43(30)<br />

C 4 H 10 O 2-Butanol 74(0.30) 45(116) 31(23) 59(22) 27(20)<br />

C 4 H 10 O Diethyl ether 74(22) 31(73) 59(34) 29(29) 45(28)<br />

C 4 H 10 O Methyl isopropyl ether 74(8.3) 59(126) 29(42) 43(37) 15(32)<br />

C 4 H 10 O 2 1,1-Dimethoxyethane 90(0.06) 59(93) 29(52) 15(37) 31(37)<br />

C 4 H 10 O 2 1,2-Dimethoxyethane 90(12) 45(177) 29(53) 15(50) 60(16)<br />

C 4 H 10 O 2 2-Ethoxyethanol 90(0.49) 31(112) 29(57) 59(56) 27(31)<br />

C 4 H 10 O 2 Diethyl peroxide 90(20) 29(116) 15(42) 45(34) 62(30)<br />

C 4 H 10 S 3-Methyl-2-thiabutane 90(41) 41(49) 75(47) 43(41) 48(38)<br />

C 4 H 10 S 2-Thiapentane 90(58) 61(126) 48(50) 41(43) 27(43)<br />

C 4 H 10 S 3-Thiapentane 90(41) 75(59) 47(51) 27(39) 61(33)<br />

C 4 H 10 S 2-Methyl-1-propanethiol 90(35) 41(60) 43(46) 56(34) 47(29)<br />

C 4 H 10 S 2-Methyl-2-propanethiol 90(34) 41(68) 57(61) 29(44) 39(21)<br />

C 4 H 10 S 1-Butanethiol 90(40) 56(74) 41(65) 27(42) 47(31)<br />

C 4 H 10 S 2-Butanethiol 90(34) 41(56) 57(50) 61(46) 29(46)

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