Table 2.

δ¹³C Values for Hydropyrolysis Products Alongside Other Free and Pyrolysis Data for Aromatic Units in Murchison

Compound	# rings	# C	# subs	Free δ13C‰	Ref	PyGC-C-IRMS δ13C‰	Ref	H2O-Py δ13C‰	Ref	H2-Py δ13C‰
benzene	1	6	0	−28.7 ± 0.2	[1]
toluene	1	7	1	−28.8 ± 1.1	[2]	−1.3 ± 2.0	[3]	−24.6 ± 0.2	[2]	−6.3
						−5.4	[3]
meta+para xylene	1	8	2					−19.6	[2]	−2.5
meta-xylene		8	2			−21.7 ± 0.4	[3]
						−20.3	[3]
ortho-xylene	1	8	2					−17.8	[2]	−4.4
C3-alkylbenzene	1	9	3					−18.1	[2]
benzaldehyde	1	7	1			−23.7 ± 0.6	[3]
						−24.0 ± 0.3	[3]
phenol	1	6	1					−24.1	[2]
2-methylphenol	1	7	2					−10.3	[2]
3-methylphenol	1	7	2			−13.9 ± 0.9	[3]	−10.4	[2]
	1					−18.5 ± 0.9	[3]
indane	2	9	0
5-methylindane	2	10	1							−5.6
4-methylindane	2	10	1							−3.5
tetralin	2	10	0							−4.0
naphthalene	2	10	0	−12.6 ± 2.3	[2]			−6.5	[2]
benzothiophene	2	8	0					−15.8	[2]
2-methylnaphthalene	2	11	1	−5.8	[2]			−5.6 ± 2.1	[2]
1-methylnaphthalene	2	11	1	−11.1	[2]			−7.2 ± 2.0	[2]
biphenyl	2	12	1
acenaphthene	3	12	0					−5.9 ± 1.7	[2]
phenanthrene	3	14	0	−7.5 ± 1.2	[4]
4,5-dihydropyrene	3	16	0							−25.0
fluoranthene	4	16	0	−5.9 ± 1.1	[4]
pyrene	4	16	0	−13.1 ± 1.3	[4]					−23.1
2-methylpyrene	4	17	1							−21.5
4-methylpyrene	4	17	1							−20.5
1-methylpyrene	4	17	1							−21.2
chrysene	4	18	0	−14.5 ± 2.2	[4]
methylbenzo[c]phenanthrene	4	19	0							−25.5
benzo[ghi]fluoranthene	5	18	0	−14.2 ± 2.2	[4]
benzo(e)pyrene	5	20	0	−22.3 ± 4.1	[4]
benzo(j)fluoranthene	5	20	0	−15.4 ± 3.3	[4]

References: [1] Yuen et al. (1984); [2] Sephton et al. (1998); [3] Sephton and Gilmour (2001); [4] Gilmour and Pillinger (1994).

# rings = number of rings; # C = carbon number; # subs = number of substituent carbon atoms on rings; H₂O-Py = hydrous pyrolysis; H₂-Py = hydropyrolysis.