Publication

Metalation of olefinic positions in norbornadiene: enhancement and attenuation of kinetic CH-acidities by a neighboring enesilane moiety

Manfred Schlosser
1986
Journal Articles

Abstract

When treated with BuLi in the presence of Na or K tert-butoxide, 2-(trimethylsilyl)- and 2-(triethylsilyl)norbornadiene undergo H/metal-exchange mainly at the 5-position. The latter position is slightly activated relative to unsubstituted norbornadiene while the 2 other olefinic positions prove to be a quite inert. Two side reactions are obsd.: the metalation of Si-attached Me groups and the replacement of the entire trialkylsilyl group by a metal atom. [on SciFinder (R)]

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Manfred Schlosser
1986
Journal Articles

Abstract

Official source

Related concepts (32)

Metal

A metal (from Ancient Greek μέταλλον métallon 'mine, quarry, metal') is a material that, when freshly prepared, polished, or fractured, shows a lustrous appearance, and conducts electricity and heat relatively well. Metals are typically ductile (can be drawn into wires) and malleable (they can be hammered into thin sheets). These properties are the result of the metallic bond between the atoms or molecules of the metal. A metal may be a chemical element such as iron; an alloy such as stainless steel; or a molecular compound such as polymeric sulfur nitride.

Post-transition metal

The metallic elements in the periodic table located between the transition metals to their left and the chemically weak nonmetallic metalloids to their right have received many names in the literature, such as post-transition metals, poor metals, other metals, p-block metals and chemically weak metals. The most common name, post-transition metals, is generally used in this article. Physically, these metals are soft (or brittle), have poor mechanical strength, and usually have melting points lower than those of the transition metals.

Transition metal

In chemistry, a transition metal (or transition element) is a chemical element in the d-block of the periodic table (groups 3 to 12), though the elements of group 12 (and less often group 3) are sometimes excluded. The lanthanide and actinide elements (the f-block) are called inner transition metals and are sometimes considered to be transition metals as well. Since they are metals, they are lustrous and have good electrical and thermal conductivity.

Related publications (3)

Metalation of olefinic positions in norbornadiene: enhancement and attenuation of kinetic CH-acidities by a neighboring enesilane moiety

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