However, this allene is difficult to prepare and has no industrial significance.

Evidence for the intermediacy of an allene oxide (3) is presented.

Standard synthetic steps have been used to convert 7-methylenequadricyclane into the spiro-cyclopropene 1 and the allene 2.

The key step in the synthesis was a photochemical cycloaddition of 5 and allene.

Allene oxides are very reactive and often only live for a microsecond.

With use of certain propargyl sulfides the reaction product is an allene.

The allene oxides react rapidly with water to give α-hydroxyketones.

Scheme 7 shows the preparation from cyclobutenone from an allene.

But his wife, Allene, who is now 66 years old and has never remarried, has grown tired of hoping.

"It was really stupid, leaving the children like that," Allene Ingram said after the service.

"I thought our guys did a great job, every one of them," said Johnson, whose mother, Allene, died on Sunday.

In carbo-benzene the ring bonds are extended with alkyne and allene groups.

Because of the symmetry, an unsubstituted allene has no net dipole moment.

The resulting cyclopropylcarbene rearranges to form the allene product.

It can for example also be applied in a conversion of a ketene into an allene:

Allene Hughes died in March 1922 from complications of an ectopic pregnancy.

This allene rearranges to the triazafulvene in a 6 pi electrocyclization.

The allene motif is frequently encountered in carbomers.

"We decided we had to do something different to try to stop this," said Allene Mares, the health department official in charge of the effort.

The plan, said Allene Clarkson, a homeowner in the area for 27 years, made many residents "forget about the snow and see red."

Phyllis Graham and Allene Craig had felt safe there.

• ion, from allene and neutral alkanes were investigated by mass spectrometry.

The parent compound of allene is propadiene.

The desired product could be obtained as a mixture with the corresponding allene as the major product.

The last Postmistress was Allene Bruton, who also ran a small general store.