Schmelzpunkte: Schmelzpunktsmikroskop (Fa. Reichert). -NMR: Varian EM 360 A, Bruker WM-300 (Tetramethylsilan als interner Standard). -MS: Varian MAT 31 1 A mit Datensystem S-100 MS. -Saulenchromatographie (SC): Kieselgel (0.063-0.200 mm; Fa. Macherey-Nagel). -Praparative Schichtchromatographie (PSC): Kie~elgel-PF~~~-und Al~miniumoxid-PF~~~-(Typ E)-Fertigplatten (Fa. Merck).
Allgemeine Vorschrijt zur Darstellung der 2,3-disubstituierten 2-Cyclopropen-I-carbonsaureester 3a-e: 100 mmol 1 a-d und 1.50 g Kupferstaub werden auf 135-145°C erhitzt. Bei dieser Temp. tropft man 100 mmol Diazoessigsaureester 2a, b so zu, daS die Stickstoffentwicklung ohne starkes Aufschaumen erfolgt. Nachdem
ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.