Abstract: Synthesis of mono-substituted alkylcyclopentadienes by mixing alkyl iodides with cyclopentadienyl magnesium chloride in tetrahydrofuran is described.

Abstract: An approved demodulator is disclosed for demodulating optical ASK data signals whose data bits are each characterized by either an absence of pulses or a burst of pulses at a predetermined frequency. The demodulator includes an amplifier tuned to this predetermined frequency, and it further includes an edge detector that produces an envelope of the amplified signal. A comparator then compares the envelope signal with a prescribed threshold, to produce a pulse signal for each received burst of pulses. The duration of this pulse signal is then stretched so as to correspond to the pulse burst's expected nominal duration. The demodulator is specially configured such that it can properly demodulate ASK data signals having power levels that vary over a range of several orders of magnitude.

Abstract: A method for synthesizing tetramethylcyclopentadiene from 2,3-dibromobutane is described. A 2-bromo-2-butene Grignard is reacted with an ethyl formate to produce a 3,5-dimethyl-2,5-heptadiene-4-ol magnesium bromide which is then quenched with acetic acid to produce 3,5-dimethyl-2,5-hepadiene-4-ol.

Abstract: A method for producing an alkyl cyclopentadiene by reacting cyclopentadienyl Grignard with an alkyl halide and for converting the alkyl cyclopentadiene to a bis(n-alkyl cyclopentadienyl) Group IV metal dihalide is described.

Abstract: An IR transceiver for use in low-power, low cost environments such as portable computers and hand-held calculators. The transceiver can transmit data at higher, selectable baud rates and at greater distances than previously possible. On the transmitting side the transceiver elements include a serial interface device, encoder circuitry and an IR transmitter with LEDS having fast turn-on and turn-off times. On the receiving side are decoder circuitry coupled to the serial interface device and an IR receiver designed specifically for a photo diode. A baud rate generator provided by the serial interface device sets the baud rate in the encoding and decoding circuitry. The receiver portion of the IR transceiver automatically sets itself to the baud rate of received data. Because of the baud rate selectability, the IR transceiver is compatible with prior IR transceivers that are limited to fixed baud rates.