Porphyrins of Serpiano shale: Structures and origins

Conference · Tue Apr 01 04:00:00 EST 1986 · Am. Chem. Soc., Div. Pet. Chem., Prepr.; (United States)

OSTI ID:5669768

Chicarelli, M I; Maxwell, J R

A prerequisite for understanding the origins and degradative pathways of sedimentary alkyl porphyrins is full structural characterization of individual components of such complex mixtures. Thus, the structures of a number of porphyrins from the Serpiano oil shale (Triassic, Monte San Giorgio, Switzerland) have been investigated, acetylation being applied in the separation of components containing unsubstituted ..beta..-positions. HPLC of demetallated fractions has allowed isolation of a number of components, mainly containing an exocyclic alkano ring. The structures (as the zinc (II) complexes) were studied by proton NMR, using selective decoupling and nuclear Overhauser effect (n.O.e.) studies, and by mass spectrometry under chemical ionization conditions using H/sub 2/ as reagent gas. Such an approach afforded the full assignment of a variety of structures, including components with a five, a methyl-substituted size or a seven membered exocyclic ring. In addition, the structure of a widely occurring mono-unsubstituted C/sub 30/ aetioporphyrin has been established fully. The number of Serpiano porphyrins characterized extends the known series of isomeric types, and their structures have been rationalized in terms of geochemical alteration of known chlorophylls. The individual components have also been used as standards in applied studies of sedimentary porphyrin distributions using HPLC and GC-MS co-chromatography.

• Research Organization: School of Chemistry, Univ. of Bristol, Bristol BS8 1TS
• OSTI ID: 5669768
• Report Number(s): CONF-860425-
• Conference Information: Journal Name: Am. Chem. Soc., Div. Pet. Chem., Prepr.; (United States) Journal Volume: 31:2
• Country of Publication: United States
• Language: English

Related Subjects

04 OIL SHALES AND TAR SANDS
040201* -- Oil Shales & Tar Sands-- Site Geology-- (-1989)
040500 -- Oil Shales & Tar Sands-- Properties & Composition
ACETYLATION
ACYLATION
AROMATICS
BITUMINOUS MATERIALS
CARBONACEOUS MATERIALS
CARBOXYLIC ACIDS
CHEMICAL ANALYSIS
CHEMICAL REACTIONS
CHEMISTRY
COMPLEXES
ENERGY SOURCES
FOSSIL FUELS
FUELS
GEOCHEMISTRY
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
MATERIALS
NMR SPECTRA
OIL SHALES
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORIGIN
OVERHAUSER EFFECT
PORPHYRINS
SPECTRA
ZINC COMPLEXES