How is tetramethoxyethylene formed from dimethoxycarbene?

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carbene Nonbonding orbitals in triplet and singlet states

Tetramethoxyethylene is formed from dimethoxycarbene through a process known as dimerization. This intermolecular reaction involves the combination of two molecules of the carbene to produce an olefin with a molecular formula exactly twice that of the original carbene.1