Penicillins

Mcgregor, D. N.

doi:10.1016/b978-008096519-2.00117-x

Cited by 5 publications

(1 citation statement)

References 178 publications

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“…The Iquiri Formation has been assigned to the Verrucosisporites and Maranhites brasiliensis zones (Pugielssi and Murillo, 1975, p. 329,337;Barrero, 1975, p. 252,254). Lobo-Boneta (1975) and McGregor (1984) also reported Maranhites from the Iquiri Formation. However, correlating between sections is a problem because of the absence of detail concerning paleontological sampling.…”

Section: Bolivia Los Monosi Formation I I Iquiri Formationmentioning

confidence: 91%

Togachitina, a new bilayered chitinozoan genus from the Devonian of the Sierras Subandinas region, Bolivia

Wood¹

1994

Palynology

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Togachitina eamesi gen. et sp. nov. is described and illustrated from the Devonian Iquiri Formation of Bolivia. This new chitinozoan is flask-shaped (ancyrochitinid-like) and has a distinctive outer wall enclosing the entire vesicle. This is the second bilayered member of the Lagenochitinidae to exhibit an outer sleeve with pronounced separation of wall layers but the first with an ancyrochitinid vesicle shape. A new subfamily, the Togachitininae, is proposed for cylindro-conical chitinozoans with separated wall layers.

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Section: Bolivia Los Monosi Formation I I Iquiri Formationmentioning

confidence: 91%

Togachitina, a new bilayered chitinozoan genus from the Devonian of the Sierras Subandinas region, Bolivia

Wood¹

1994

Palynology

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Synthese von (Methylthio)penam‐Derivaten durch Keten‐Addition an 4,5‐Dihydro‐5‐(methylthio)‐1,3‐thiazole

Jenny

Prewo

Bieri

et al. 1986

Helvetica Chimica Acta

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Synthesis of (Methy1thio)penam Derivatives via Keten Addition onto 4,5-Dihydro-5-(methyIthio)-l,3-thiazolesThe 4,5-dihydro-5-(methyIthio)-2-phenyl-1,3-thiazoles 3a and 3b, easily prepared from the corresponding 1,3-thiazol-5(4H)-thiones and MeLi, react with dichloroacetyl chloride (5a) and acidoacetyl chloride (5b) in the presence of Et,N to give (methy1thio)penam derivatives 6 ( Table 1). The reaction mechanism is either a [2 + 21 cycloaddition of in situ generated ketene or a two-step reaction (Scheme 2). The structure of 6f has been confirmed by X-ray crystallography (Fig.2). The relative configuration of 6a+2 follow from comparison of their 'H-NMR spectra with those of 6f (Fig. I). The 6-addopenams 6d and 6f have been reduced to aminopenams 8a and 8b, respectively. Acylation of 8a with phenacetyl chloride yields 9 (Scheme 4 ) .

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Four-Membered Heterocycles

Kumar

Gupta

1998

Heterocyclic Chemistry

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Penicillins

Cited by 5 publications

References 178 publications

Togachitina, a new bilayered chitinozoan genus from the Devonian of the Sierras Subandinas region, Bolivia

Togachitina, a new bilayered chitinozoan genus from the Devonian of the Sierras Subandinas region, Bolivia

Synthese von (Methylthio)penam‐Derivaten durch Keten‐Addition an 4,5‐Dihydro‐5‐(methylthio)‐1,3‐thiazole

Four-Membered Heterocycles

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