Transformation of sound complexes V+C+V from Mongolian languages to Turkic language

Of particular interest to specialists is the etymology of the long vowels of the Turkic and Mongolian languages, which are part of the Altai family, and the preservation of their various states. Despite the fact that these languages belong to the same language family, the periods of emergence and development of longitude of sounds differ. In the Mongolian languages, the process of transition of sound combinations V + C + V into long ones dates back to the 13-14th centuries. This process in the two language groups took place in different ways. If in the Mongolian languages, depending on the quality of the second vowel from the V + C + V complex (subjected to contraction), longitude arose, then in the Turkic languages, on the contrary, the quality of the longitude appearing in the next syllable was determined by the vowel of the first syllable. If the longitude of the sound combination V + C + V from the Mongolian languages was perceived as a ready-made linguistic fact, then it was found that in most cases such complexes, after assimilation, acquired longitude in accordance with the internal laws of the Turkic languages.