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In the Reimmer-Timmer reaction cho group is added to only at ortho position not at para position , I got the answer for this as ortho effect. So what is exactly ortho effect.

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I think that the coordination step is responsible for the ortho selectivity. The phenoxide anion has a large negative charge on the oxygen atom, so the electron-poor carbene will tend to go there and the conjugated attack will result in the ortho product.

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