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This cannot rigorously be described as sigma-pi conjugation since sigma and pi here refer to different defining planes, and interaction between orbitals of different symmetries (with respect to the same defining plane) is forbidden.
Pi or is a mathematical constant, one of the first ever discovered. It is the ratio of the distance around a circle to the circle's diameter.This produces a number, and that number is always the same.However, the number is rather strange.he distance around a circle is known as the circumference. Even though the diameter and circumference are different for different circles, the number pi remains constant: its value never changes. This is because the relationship between the circumference and diameter is always the same.