Manfred Staehle

Ring tension, hydrocarbon acidity, and new super-bases (1986)

Schlosser, Manfred, Hartmann, Juergen, Staehle, Manfred, Kramar, Jaroslav, Walde, Annelies, Mordini, Alessandro

Addn. of di-Na pinacolate or KOCMe3 increased the transmetalating power of pentylsodium in alkane solvents. Some hydrocarbons thus metalated were Me3CCH:CH2, camphene, bicyclo[2.2.2]octene,...

Hetero-atom effects on kinetic acidities: the metalation of 1-methylcyclohexene and its 4-aza- and 4-oxa-analogs (1985)

Moret, Etienne, Schneider, Philippe, Margot, Christian, Staehle, Manfred, Schlosser, Manfred

Hexane suspensions of Me3SiCH2K or BuLi/Me3COK deprotonated 1-methylcyclohexene almost exclusively at the Me group. In contrast 1,4-dimethyl-1,2,3,6-tetrahydropyridine and...

Acidity enhancement through homoconjugation: selective introduction of sodium into olefinic positions (1985)

Staehle, Manfred, Lehmann, Ruth, Kramar, Jaroslav, Schlosser, Manfred

When treated with BuLi and Me3CONa, both norbornadiene and norbornene underwent a H/Na-exchange at the 2-position. The diene, however, reacted approx. 30 times faster with Me3SiCl....

Nonplanar structures of allyl- and pentadienylmetal compounds: folding for better charge distribution? (1982)

Schlosser, Manfred, Staehle, Manfred

The 2J (13C, H), a measure of bond angle in CH2:CHCH2R (R = MgBr, Li, Na, K), (Z)- and (E)-MeCH:CHCH2K, CH2:CHCH:CHCH2R (R = Li, K), or (E)-hexadienyllithium, is used to assign the % s character in...

Neue 13C-spektroskopische Untersuchungen zur Struktur von Allylmetall-Verbindungen (1981)

Staehle, Manfred, Schlosser, Manfred

High-resoln. 13C NMR spectra of terminally monodeuterated alkali metal and alk. earth metal allyl compds. confirm earlier structure assignments: allylmagnesium bromide exists in a s-covalent...

Allylic Compounds of Magnesium, Lithium and Potassium : sigma- oder pi-Structures ? (1980)

Schlosser, Manfred, Staehle, Manfred

The s- vs. p-character of title allylmetal compds. was studied via 13C NMR of R2CR1:CRCH2N (R = H, Me2CH, Me3C, R1 = R2 = H; R = R1 = H, R2 = Me; R = H, R1 = R2 = Me; M = Li, K, MgBr) and of...

Metalated 2-Alkenyl- and 1,2-Alkadienyl 2-Tetrahydropyranyl Ethers : Versatile Building Blocks for Furan Syntheses (1979)

Staehle, Manfred, Schlosser, Manfred

Me3CLi metalated LiOCH2C:CCH2OTHP (THP = tetrahydro-2-pyranyl) quant. to LiOCH2CLi:C:CHOTHP which was treated with MeOH, Me(CH2)5I, or PhCH2Cl to give LiOCH2CR:C:CHOTHP [I; R = H, (CH2)5Me, CH2Ph]....

Selective syntheses with organometallics. VI. Capricious stereoselectivities of alkenylpotassium formation under kinetic and thermodynamic control. Oxygen-triggered configurational equilibration of an allyl type organometallic compound (1977)

Staehle, Manfred, Hartmann, Juergen, Schlosser, Manfred

Metalation at the allylic site (Me group) of (Z)-RCH:CHMe (R = alkyl) is more rapid than with the E-isomers regardless of the configuration in which the resultant organometallic is more thermodn....

alpha-Metallierte Enäther als "Masken" für Acyl-Anionen (1974)

Hartmann, Juergen, Staehle, Manfred, Schlosser, Manfred

H2C:CHCH2OR (R = tetrahydropyranyl) gave a mixt. of H2C:CHCHR1OH and R1CHCH2CHO after metalation and reaction with an electrophilic agent R1X, whereas metalation of MeCH:CHOR (R = tetrahydropyranyl)...