KR830001223A - Video disc handling system for a video disc player - Google Patents

Abstract

A protective cover, subject to a removable occupancy by a video disc, is inserted into a video disc player. During the insertion of an occupied cover into the player, an appropriately designed platform leads it to a fully inserted position. Upon playback, the lid is raised to cause the video disc to rise with the platform. An empty cover is then inserted to return the video disc back into the cover. The subsequent withdrawal of the cover removes the enclosed video disc.

Description

N- (2-substituted-4-pyridyl) urea and thioureas, their preparation and plant growth regulators

As this is a public information case, the full text was not included.

Claims (4)

General formula) I): [Wherein R ¹ represents hydrogen, halogen or alkyl group, X represents fluorine atom, cancel atom, hydroxyl group, lower alkoxy group, lower alkylthio group, lower alkoxycarbonyl group, amino group, lower alkylcarbonylamino group, benzoylamino group, lower alkoxy N- (2-substituted-4) of -Pyridyl) urea and thioureas. General formula (I): [Wherein R ₁ represents hydrogen, halogen or alkyl group, X represents fluorine atom, cancel atom, hydroxyl group, lower alkoxy group, lower alkylthio group, lower alkoxycarbonyl group, amino group, lower alkylcarbonylamino group, benzoylamino group, lower alkoxy N- (2-substituted-4) of General formula (II) to prepare pyridyl) urea and thioureas; Wherein R ₁ and X represent the above-mentioned compounds. The compound of formula (III); N- (2-substituted-4-pyridyl), which is reacted with a compound of the formula wherein Y and R represent the above, and is optionally converted to a desired substituent by hydrolysis, acylation or esterification. Preparation of urea and thioureas. General formula (I): [Wherein R ₁ represents hydrogen, halogen or alkyl group, X represents fluorine atom, cancel atom, hydroxyl group, lower alkoxy group, lower alkylthio group, lower alkoxycarbonyl group, amino group, lower alkylcarbonylamino group, benzoylamino group, lower alkoxy A carbonylamino group, a cyano group or a trifluoromethyl group, Y represents an oxygen atom, R represents a hydrogen, a lower alkyl group, a lower alkoxy group, a hydroxyl group or a halogen atom ) General formula (IV) or (IV ') for preparing urea and thioureas; [Wherein R ₁ and X represent the above], a compound represented by the general formula (V); N- (2-substituted-4-pyridyl) urea, wherein the compound is reacted with a compound of the above formula, wherein R is substituted with a desired substituent by hydrolysis, acylation, or esterification. Preparation of thioureas. General formula (I): [Wherein R ₁ represents hydrogen, halogen or alkyl group, X represents fluorine atom, cancel atom, hydroxyl group, lower alkoxy group, lower alkylthio group, lower alkoxycarbonyl group, amino group, lower alkylcarbonylamino group, benzoylamino group, lower alkoxycarbon N- (2-substituted-4-). Pyridyl) Plant growth regulator comprising urea and thiourea as an active ingredient. ※ Note: The disclosure is based on the initial application.